After successful MFP software installation I added a new printer in CUPS http://localhost:631/ (do not forget to plug in the printer to USB port!)
If you see a printer "wc3119" with "Device URI: file:/dev/null", delete it... unless you like to save some paper and trees by printing to /dev/null
I got the missing rastertosamsungspl error. (/usr/libexec/cups/filter/rastertosamsungspl)
The rastertosamsungspl on the Xerox CD and in the 3119Linux.zip is crap (maybe works for you).